use some GFO to lower your phosphates and use some Red Slime Remover. It is safe for coral but be carefull if you have real sponges as some sponges live in symbiotic with cyanobacterias inside of them.
I never had a problem using that stuff with all of my sponges but it could affect some sponges.
Quote:
Originally Posted by arash53
I do but they keep coming back
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